package Ch02.Shili.Sl1;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.FileOutputStream;

public class Demo4 {
    public static void main(String[] args)  throws Exception{
        //得到Dom解析器的工厂实例
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        //从DOM工厂获得DOM解析器
        DocumentBuilder db = dbf.newDocumentBuilder();
        //解析xml文档，得到一个Document对象，即Dom树
        Document doc = db.parse("src/Ch02/Shili/Sl1/box.xml");
        //找到修改的节点
        NodeList list = doc.getElementsByTagName("Brand");
        for (int i=0;i<list.getLength();i++){
            Element brandElement=(Element) list.item(i);
            String brandName=brandElement.getAttribute("name");
            if (brandName.equals("三星")){
                brandElement.setAttribute("name","SAMSUNG");
            }
        }
        //保存XMl文件
        TransformerFactory transformerFactory=TransformerFactory.newInstance();
        Transformer transformer=transformerFactory.newTransformer();
        DOMSource domSource=new DOMSource(doc);
        //设置编码类型
        transformer.setOutputProperty(OutputKeys.ENCODING,"utf-8");
        StreamResult result=new StreamResult(new FileOutputStream("src/Ch02/Shili/Sl1/box.xml"));
        //把DOM树转换为XML文件
        transformer.transform(domSource,result);
    }
}
